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Senior Data Scientist
OnShift
Data Science
Warsaw, Poland
Posted on Apr 25, 2025
About ShiftKey
ShiftKey is a platform that is disrupting the way healthcare facilities find licensed and certified professionals to fill available shifts. Leveraging marketplace dynamics and deep industry knowledge, the company is playing a vital role in mitigating America’s healthcare staffing shortages, enabling direct connections between facilities and healthcare professionals. By offering the opportunity to work as much or as little as they choose and putting the power back into the hands of healthcare workers, ShiftKey is bringing more licensed professionals back into the workforce, a solution that is solving a major crisis in healthcare. For more information, visit www.ShiftKey.com.
The role
As a Senior Data Scientist at ShiftKey, you’ll play a key role in shaping the future of our data science function and driving innovative solutions across both our Marketplace and SaaS products within the Healthcare space. You will lead the development and deployment of advanced machine learning models - from traditional methods to cutting-edge techniques like deep learning, Generative AI, and Graph Neural Networks (GNNs). Your work will directly impact business outcomes, delivering actionable insights that fuel growth and operational efficiency.
Where you’ll work
We are looking for someone based in Warsaw who is open to working from our office. We offer a flexible hybrid work model that encourages office presence as needed for task requirements and team collaboration, while also supporting a balanced approach between working from home and in the office.
What you’ll be doing
Lead the full process of ML models: You will be in charge of everything from understanding the business problem, determining how AI/ML can provide value, exploring data, building features, developing models, deploying them, tracking their performance, and measuring their impact on the business.
Build and improve predictive models: You’ll use statistical methods and deep learning to create models for things like market segmentation, forecasting, recommendations, pricing strategies, and fraud detection.
Design and implement Generative AI solutions: You’ll work on tasks like fine-tuning large language models (LLMs), creating effective prompts, and generating synthetic data for both internal tools and customer-facing applications.
Use Graph Neural Networks for relationship modeling: You’ll apply these models to understand relationships between healthcare facilities, professionals, and other related attributes like shifts.
What you’ll need
6+ years of data science experience, ideally with a background in two-sided marketplaces or supply chain management.
Experience with advanced ML models like regression, neural networks, and recommender systems.
Proficiency in Python, SQL, and popular libraries like scikit-learn, PyTorch, TensorFlow, and XGBoost.
Familiarity with LLMs and Generative AI frameworks (e.g., LangChain, Hugging Face, OpenAI API).
Experience with network graph analysis and building/deploying GNN solutions (using tools like networkx, iGraph, PyG).
Comfortable writing production-level code and working with software engineers and MLOps teams.
Strong communication skills for effective coordination across teams.
Perks of working for ShiftKey
A high-growth, friendly, and engaging work environment with opportunities for career development.
Additional vacation days for better work-life balance.
Modern office in Warsaw’s Powiśle district with Vistula River views, recreational facilities, and great nearby restaurants.
Thoughtfully designed private medical package to take care of what matters most.
Sports card to fuel your active lifestyle.
Life and accident insurance for peace of mind.
#LI-Hybrid #LI-AT1
Our Commitment to Diversity
ShiftKey is an equal opportunity employer and is committed to embracing diverse and individual perspectives shaping our culture and contributing to the solutions that transform the world. We actively work to create an inclusive environment for employees to thrive.
EEO Statement
ShiftKey does not discriminate based on race, religion, color, sex, gender, gender identity, sexual orientation, age, non-disqualifying physical or mental disability, national origin, veteran status, or any other basis covered by applicable law. All employment is decided based on qualifications, merit, and business needs. ShiftKey is committed to providing reasonable accommodation to applicants with a mental or physical disability, please contact: [email protected]
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